Preliminary study of kaonic deuterium X-rays by the SIDDHARTA experiment at DAFNE
Abstract
The study of the KbarN system at very low energies plays a key role for the understanding of the strong interaction between hadrons in the strangeness sector. At the DAFNE electron-positron collider of Laboratori Nazionali di Frascati we studied kaonic atoms with Z=1 and Z=2, taking advantage of the low-energy charged kaons from Phi-mesons decaying nearly at rest. The SIDDHARTA experiment used X-ray spectroscopy of the kaonic atoms to determine the transition yields and the strong interaction induced shift and width of the lowest experimentally accessible level (1s for H and D and 2p for He). Shift and width are connected to the real and imaginary part of the scattering length. To disentangle the isospin dependent scattering lengths of the antikaon-nucleon interaction, measurements of Kp and of Kd are needed. We report here on an exploratory deuterium measurement, from which a limit for the yield of the K-series transitions was derived: Y(K_tot)<0.0143 and Y(K_alpha)<0.0039 (CL 90%). Also, the upcoming SIDDHARTA-2 kaonic deuterium experiment is introduced.
Keywords
Cite
@article{arxiv.1302.2797,
title = {Preliminary study of kaonic deuterium X-rays by the SIDDHARTA experiment at DAFNE},
author = {M. Bazzi and G. Beer and C. Berucci and L. Bombelli and A. M. Bragadireanu and M. Cargnelli and C. Curceanu and A. d'Uffizi and C. Fiorini and T. Frizzi and F. Ghio and C. Guaraldo and R. Hayano and M. Iliescu and T. Ishiwatari and M. Iwasaki and P. Kienle and P. Levi Sandri and A. Longoni and J. Marton and S. Okada and D. Pietreanu and T. Ponta and A. Romero Vidal and E. Sbardella and A. Scordo and H. Shi and D. L. Sirghi and F. Sirghi and H. Tatsuno and A. Tudorache and V. Tudorache and O. Vazquez Doce and E. Widmann and J. Zmeskal},
journal= {arXiv preprint arXiv:1302.2797},
year = {2015}
}
Comments
Accepted by Nuclear Physics A